China's criminal justice and prison system is known for being notoriously opaque—trials move swiftly, the guilty sometimes disappear. Here are images from inside two detention centers in Beijing, after government authorities took journalists on a recent tour of the facilities.

China’s criminal justice and prison system is known for being notoriously opaque—trials move swiftly, the guilty sometimes disappear. Here are images from inside two detention centers in Beijing, after government authorities took journalists on a recent tour of the facilities.